Electrical Knowledge from the Experts These Houston Electricians Know Best!
"What the National Electrical Code 2005 Says About Aluminum Wiring Devices"
Receptacles rated 20 amps or less and designed for the direct connection of aluminum wire shall be marked CO/ALR.
Switches rated 20 amps or less directly connected to aluminum wire shall be marked CO/ALR.
What is CO/ALR? a device that has specific characteristics minimizing the effects of aluminum expansion and contraction, thereby rendering the device safer for a direct connection to an aluminum conductor.
